A novel TMD-based peroxidase-mimicking nanozyme: From naked eye detection of leukocytosis-related diseases to sensing different bioanalytes

•Superior peroxidase activity & thermal/storage stability of MCFS/rGO compared to HRP.•A novel and equipment-free sensing method to diagnose leukocytosis-related diseases.•First report on using WBCs as the source of substrate generation for peroxidase reactions.•An accurate and pioneering nanozyme-based coupling assay for quality control of honey.•A multipurpose sensor with healthcare, food, and environmental industry applications.